/* Copyright 2011 Jun Wako <wakojun@gmail.com> Copyright 2021 Simon Arlott This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #pragma once #if __has_include_next("_timer.h") # include_next "_timer.h" /* Include the platform's _timer.h */ #endif #include <stdint.h> #define TIMER_DIFF(a, b, max) ((max == UINT8_MAX) ? ((uint8_t)((a) - (b))) : ((max == UINT16_MAX) ? ((uint16_t)((a) - (b))) : ((max == UINT32_MAX) ? ((uint32_t)((a) - (b))) : ((a) >= (b) ? (a) - (b) : (max) + 1 - (b) + (a))))) #define TIMER_DIFF_8(a, b) TIMER_DIFF(a, b, UINT8_MAX) #define TIMER_DIFF_16(a, b) TIMER_DIFF(a, b, UINT16_MAX) #define TIMER_DIFF_32(a, b) TIMER_DIFF(a, b, UINT32_MAX) #define TIMER_DIFF_RAW(a, b) TIMER_DIFF_8(a, b) #ifdef __cplusplus extern "C" { #endif extern volatile uint32_t timer_count; void timer_init(void); void timer_clear(void); uint16_t timer_read(void); uint32_t timer_read32(void); uint16_t timer_elapsed(uint16_t last); uint32_t timer_elapsed32(uint32_t last); // Utility functions to check if a future time has expired & autmatically handle time wrapping if checked / reset frequently (half of max value) #define timer_expired(current, future) ((uint16_t)(current - future) < UINT16_MAX / 2) #define timer_expired32(current, future) ((uint32_t)(current - future) < UINT32_MAX / 2) // Use an appropriate timer integer size based on architecture (16-bit will overflow sooner) #if FAST_TIMER_T_SIZE < 32 # define TIMER_DIFF_FAST(a, b) TIMER_DIFF_16(a, b) # define timer_expired_fast(current, future) timer_expired(current, future) typedef uint16_t fast_timer_t; fast_timer_t inline timer_read_fast(void) { return timer_read(); } fast_timer_t inline timer_elapsed_fast(fast_timer_t last) { return timer_elapsed(last); } #else # define TIMER_DIFF_FAST(a, b) TIMER_DIFF_32(a, b) # define timer_expired_fast(current, future) timer_expired32(current, future) typedef uint32_t fast_timer_t; fast_timer_t inline timer_read_fast(void) { return timer_read32(); } fast_timer_t inline timer_elapsed_fast(fast_timer_t last) { return timer_elapsed32(last); } #endif #ifdef __cplusplus } #endif